--- /dev/null
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team 1998-2005
+ *
+ * Compacting garbage collector
+ *
+ * ---------------------------------------------------------------------------*/
+
+#ifndef GCCOMPACT_H
+#define GCCOMPACT_H
+
+INLINE_HEADER rtsBool
+mark_stack_empty(void)
+{
+ return mark_sp == mark_stack;
+}
+
+INLINE_HEADER rtsBool
+mark_stack_full(void)
+{
+ return mark_sp >= mark_splim;
+}
+
+INLINE_HEADER void
+reset_mark_stack(void)
+{
+ mark_sp = mark_stack;
+}
+
+INLINE_HEADER void
+push_mark_stack(StgPtr p)
+{
+ *mark_sp++ = p;
+}
+
+INLINE_HEADER StgPtr
+pop_mark_stack(void)
+{
+ return *--mark_sp;
+}
+
+INLINE_HEADER void
+mark(StgPtr p, bdescr *bd)
+{
+ nat offset_within_block = p - bd->start; // in words
+ StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
+ (offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+ StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+ *bitmap_word |= bit_mask;
+}
+
+INLINE_HEADER void
+unmark(StgPtr p, bdescr *bd)
+{
+ nat offset_within_block = p - bd->start; // in words
+ StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
+ (offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+ StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+ *bitmap_word &= ~bit_mask;
+}
+
+INLINE_HEADER StgWord
+is_marked(StgPtr p, bdescr *bd)
+{
+ nat offset_within_block = p - bd->start; // in words
+ StgPtr bitmap_word = (StgPtr)bd->u.bitmap +
+ (offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+ StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+ return (*bitmap_word & bit_mask);
+}
+
+void compact(void);
+
+#endif /* GCCOMPACT_H */